Ok quick question for yall. My tds is coming in at 200 and post tfc is 40 and post di is 0 and im shelling thru di resin fast. Question is can i back flush to help membrane or do i need to just replace? Had it over a yr now and never back flushed it. Just dont know how. Do i put post carbon line into exit of good water of membrane or waste water membrane? Any help would be grateful. Even if i had to change tfc can yall help me on backflushing i have corallife 2 ro with add on di